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Roidfingers
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« on: August 27, 2016, 01:59:46 PM » |
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As some have seen, I have a very open exhaust. I have pulled carbs and cleaned and installed 38 pj's. Also new after market needles. Set mixture screw at 2 1/4. Was running very rich. Then set them at 1 3/4. Running great but still think a tad to rich. Thinking about going to 1 1/2. I also have K&N filter. How do you know if its to lean? Not enough power/fuel? I do still get a little popping and or back fire on decal. 
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John Schmidt
Member
Posts: 15220
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #1 on: August 27, 2016, 03:02:53 PM » |
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#38 Slow jets! Pilots are the mixtures that you adjusted.  |
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Roidfingers
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« Reply #2 on: August 27, 2016, 03:31:46 PM » |
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Yea John, I was waiting on you to get here. I looked and you weren't on line. So after my 38's I went from 2 1/4 to 1 3/4. Still getting a little on decal. Can I go 1 1/2 ? Whats the symtoms if to lean?
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98valk
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« Reply #3 on: August 27, 2016, 03:39:42 PM » |
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what indicates running too rich?
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Roidfingers
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« Reply #4 on: August 27, 2016, 03:45:08 PM » |
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You can check your plugs , but I could smell mine and also at start, White smoke at exhaust. Also when I adjusted the mixture screw I had fuel in the intake rubbers when I removed them to make the adjustment. ( Yes I know you don't have to remove them, but I have big hands and I wanted to get it accurate.
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John Schmidt
Member
Posts: 15220
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #5 on: August 27, 2016, 05:07:04 PM » |
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Yea John, I was waiting on you to get here. I looked and you weren't on line. So after my 38's I went from 2 1/4 to 1 3/4. Still getting a little on decal. Can I go 1 1/2 ? Whats the symtoms if to lean?
See, I didn't want to disappoint you.  Re. the plugs, they'll be white if running too lean, sooty if too rich. Check the plugs before doing any more adjusting. |
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Roidfingers
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« Reply #6 on: August 27, 2016, 05:56:28 PM » |
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Thank John, that's my next step then too.
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98valk
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« Reply #7 on: August 27, 2016, 06:25:15 PM » |
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insulators only change color if pig rich or aftermarket fuel additives due to ethanol fuel. My insulators are always white, with maybe a very,vert lite tan only in certain areas, and I just dyno'd with 4 gas analyser and at idle and midrange it was where it is suppose to be. I've found example #2 applies for idle and timing marks. http://www.4secondsflat.com/Spark_plug_reading.html |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #8 on: August 28, 2016, 04:09:00 AM » |
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These monster tend to run rich, and, with 38s I think you would really have to work at it to get it too lean. I don't think it would hurt to set the pilots at 1.5 turns if you want. That doesn't take much too try it and if you don't like it its easy to fix. Its only time. With the exhaust as open as yours is I think it would be hard to eliminate all decel popping.
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indybobm
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« Reply #9 on: August 28, 2016, 07:12:08 AM » |
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You can check your plugs , but I could smell mine and also at start,
With your exhaust, you are going to get subjected to more exhaust smell than someone with more normal pipes. |
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So many roads, so little time
VRCC # 5258
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Roidfingers
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« Reply #10 on: August 28, 2016, 07:52:35 AM » |
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That's basically all gone now that I turned them from 2 1/4 to 1 3/4
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Foozle
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« Reply #11 on: August 30, 2016, 12:00:20 PM » |
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When I switched to 38 slow jets, removal of the K & N pre-filter seemed to balance things out nicely for me. However, I'm running stock exhaust - so your mileage may obviously vary. Terry
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N0tac0p
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« Reply #12 on: September 07, 2016, 06:29:30 AM » |
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what screws are you adjusting to lean it out?
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Roidfingers
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« Reply #13 on: September 07, 2016, 08:56:15 AM » |
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Fuel/air mixture screw. Its on the carburetor, upside down, "D" shaped and directly behind the intake tube.
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